• Pararealgar - Wikipedia

    en.wikipedia.org/wiki/Pararealgar Pararealgar is an arsenic sulfide mineral with the chemical formula As 4 S 4 also represented as AsS. It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, As 4 S 4.It is soft with a Mohs hardness of 1 - 1.5, is yellow orange in colour, and its monoclinic prismatic crystals are very brittle, easily ...
  • Pararealgar: Mineral information, data and localities.

    www.mindat.org/min-3107.html Red realgar alters to yellow/yellow-orange pararealgar on exposure to light. Primary pararealgar is, however, also known.
  • Pararealgar: The mineral pararealgar: information and pictures

    www.minerals.net/mineral/pararealgar.aspx Pararealgar is the alteration product of the mineral Realgar. It forms when Realgar is exposed to light, which causes a physical change in the structure of the mineral and transforms it into a new mineral. Pararealgar is has the same chemical composition and chemical formula as Realgar, but its crystal form differs. Pararealgar is also ...
  • Pararealgar Mineral Data

    webmineral.com/data/Pararealgar.shtml General Pararealgar Information : Chemical Formula: AsS : Composition: Molecular Weight = 106.99 gm Arsenic 70.03 % As: Sulfur 29.97 % S: 100.00 % : Empirical Formula:
  • Pararealgar Mineral Specimen For Sale - Dakota Matrix Minerals

    www.dakotamatrix.com/products/13958/pararealgar Pararealgar - Orange to red Pararealgar, an alteration of Realgar which is associated with Pyrite on the backsite. . This and many more mineral specimens are available for sale at Dakota Matrix Minerals.
  • Pararealgar - Mindat.org

    www.mindat.org/gm/3107 Pararealgar Jas Roux, La Chapelle-en-Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France Orange pararealgar (EDX XRD confirmed) FOV 7 mm Collected by Georges Favreau and Vincent Bourgoin with the written authorization of the national Parc des Ecrins during the study of the deposit by the Jean Wyart association.
  • Realgar: The arsenic mineral realgar: information and pictures

    www.minerals.net/mineral/realgar.aspx Pararealgar is unstable and will eventually crumble into a yellow powder if left in the light. The alteration mineral that Realgar transformed into was generally assumed to be Orpiment, but recent scientific analysis has in fact determined the orange alteration product as Pararealgar. Due to the instability of Realgar, specimens should be ...
  • Pigments through the Ages - Overview - Realgar

    www.webexhibits.org/pigments/indiv/overview/realgar.html Realgar and Pararealgar, the unbreakable couple . Very rare, early 13th century, Byzantine Syriac Gospel lectionary, 1216–1220 AD, British Library Oriental and India Office Collection. This Gospel lectionary consists of 264 folios with text and sixty illuminations and is valued at more than US$1 million.

    www.ebay.com/itm/.../223824014494 This great PIECE present a beautiful cristals of RARE PARAREALGAR in combination with REALGAR, GALENAS and WHITE BARITES on MATRIX, the contrast between these materials is wonderful, arriving straigh from the Andean region of Perú, PALOMO MINE.
  • Realgar - Wikipedia

    en.wikipedia.org/wiki/Realgar Realgar, α-As 4 S 4, is an arsenic sulfide mineral, also known as "ruby sulphur" or "ruby of arsenic". It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, often in association with the related mineral, orpiment (As 2 S 3).It is orange-red in color, melts at 320 °C, and burns with a bluish flame releasing fumes of arsenic and sulfur.